#include<iostream>
#include<stdio.h>

#include<string.h>
#include<unistd.h>

int main()
{
    //C库函数
    
    printf("hello printf \n");
    fprintf(stdout,"hello fprintf\n");
    const char *message="hello fwrite\n";
    fwrite(message,1,strlen(message),stdout);


    //系统调用
    const char*w="hello write\n";
    write(1,w,strlen(w));




    fork();
    return 0;
}
